Printing press



Feb. 24, 1925. I I 1,527,299

H. W. HACKER PRINTING PRESS Filed May 5, 1.924

Patented Feb. 24, 1925.

pairs srares HORACE W. HACKER, CHICAGG, ILLINOIS, ASSIGNOR 'IO HACKERMANUFACTURING (30., OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

PRINTING PRESS.

Application filed May 5, 1924. Serial No. 711,057.

To all 4.0710122 it may, concern:

Be it known that I, Honnon 1V. HACKER, a citizen of the United States,residing at Cl 'cago, in the county of Cool; and the State of Illinois.have invented a certain new and useful Improvement in Printing Presses,of which the following is a full, clear, concise, and exact description.

My invention relates to printing presses that are employed in colorprinting and which are provided with normally station ary registeringpins in their plate supporting beds which serve, in conjunction withmovable pins, to locate each plate of a series successively in exactlythe same loca tion. These normally stationary pins are, in recent formsof presses, shit-table from place to place. Pincers have been employedto grip the projecting printing plate engaging ends of these pins forthis purpose. with the result that the pins would become marred andrendered incapable of exactly position- .ing the plates. To obviate thisundesirable result, the body portion of the noru'ially stationary pinhas a reduced portion near and larger than the projection portion forthe re ception of a removing tool. The pin receiving hole in the bed islaterally extended where the pin projects to afford access for the tool.

It sometimes happens that the projecting portion of the pin is notexactly coaxial with the body portion. I provide registering or complenental indices upon the pin and the bed at the various holes which mayreceive the pin, so that the projecting portion of the pin may be easilybrought to similar locations in the various holes.

The invention will be more fully eX- plained in connection. with theaccompanying drawing in which Fig. 1. is a plan view of a portion ofpress having a plate supporting bed therein that carries platepositioning pins;

Fig. 2 is a sectional view on line 22 of Fig. 1;

Fig. 3 is a plan view, 011 a larger scale, of a part of the bed;

Fig. 4 is a view, on a larger scale, of a part of the structure as itappears in Fig. 2; and

Fig. :3 illustrates the method of dislodging the normally stationarypin.

The plate supporting bed 1 may be fastened upon the reciprocating member2 of the press by any suitable means, such as the bolts 3.

The bed is formed with a number of holes l, one ot these holes beingselected for the location of a pin 5 that is permanent tor a givenseries of impositions of printing plates 6. The bed is formed with along groove which receives a block 8 that carries a pin 9. This block isadjustable in the groove so that after the fixedly placed pin 5 issnugly received in a selected hole 45 in the bed, the other pin 9 may beeasily adjusted to enter another hole in the plate. whereby the plate isexactly held on the bed. Each pin has a larger body portion 10 intendedto be coaxial with the reduced portion, but sometimes being out of true.it the pin. that is out of true is not located similarly in each of theholes .4: in the bed designed to snugly receive the body portion, theplates may be thrown out of register. I therefore form the bed at thepin receiving holes and the pin with registering or complement-a1indices 11, 12.

The pin body portion is formed with one or more annular grooves 13adjacent the reduced projecting end of the pin 5 and the pin receivingholes l are laterally extended where the pin projects as indicated at14-, whereby adislodging tool 15 may be employed as indicated in Fig. 5.

Having thus described my claim 1. The combination with. a printing pressbed,- of an upright pin having a body por tion slidably received inholes that are formed in the bed and a reduced portion projecting abovethe bed, the body protion having a reduced portion near and larger thanthe projecting portion for the reception of a removing toolf 2. Thecombination with a printing press bed; of an upright pin having a bodyportion slidably received in holes that are formed in the bed and areduced portion projecting above the bed, the body portion having agroove adjacent the projecting portion to provide a tool engagingportion.

3. The combination with a printing press bed; of an upright pin having abody portion slidably received in holes that are formed in the bed and areduced portion projecting above the bed, the body portion having areduced portion near and larger than the projecting portion for therecepinvention, I

tion of n removing tool; the pin receivinp; holes in the bed beinglaterally extended where the pin projects to afford access "for thetool.

l. The combination with a printing press bed; of an upright pin having abody portion slidahly received in holes that are formed in the bed and areduced portion projecting above the bed the body portion having itgroove adjacent the projecting 10 portion to provide a tool engagingportion; the pin receiving holes in the bed being laterally extendedWhere the pin projects to afford access for the tool.

In Witness whereof, I hereunto sub- 15 scribe my name.

HORACE W. HACKER.

